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Question
Chemistry
Which is least thermally stable?
Q. Which is least thermally stable?
3547
205
WBJEE
WBJEE 2018
The s-Block Elements
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A
L
i
2
C
O
3
23%
B
M
g
C
O
3
15%
C
B
a
C
O
3
21%
D
B
e
C
O
3
41%
Solution:
B
e
C
O
3
is least thermally stable. The thermal stability of carbonates increases down the group i.e from Be to
B
a
.
(
523
K
)
B
e
C
O
3
<
(
813
K
)
M
g
C
O
3
<
(
1173
K
)
C
a
C
O
3
<
(
1562
K
)
S
r
C
o
3
<
(
1633
K
)
B
a
C
O
3
B
e
C
O
3
is unstable to the extent that it is stable only in atmosphere of
C
O
2
. These carbonates show reversible decomposition in closed container.
MC
O
3
⇌
MO
+
C
O
2
More stable the oxide is formed, lesser will be stability of carbonates